unit Util_UTF8;

interface

uses Windows;

type
UTF8String = AnsiString;

function AnsiToWide(const S: AnsiString): WideString;
function WideToUTF8(const WS: WideString): UTF8String;
function AnsiToUTF8(const S: AnsiString): UTF8String;
function UTF8ToWide(const US: UTF8String): WideString;
function WideToAnsi(const WS: WideString): AnsiString;
function UTF8ToAnsi(const S: UTF8String): AnsiString;

implementation

function AnsiToWide(const S: AnsiString): WideString;
var len: integer;
ws: WideString;
begin
Result:='';
if (Length(S) = 0) then
exit;
len:=MultiByteToWideChar(CP_ACP, 0, PChar(s), -1, nil, 0);
SetLength(ws, len);
MultiByteToWideChar(CP_ACP, 0, PChar(s), -1, PWideChar(ws), len);
Result:=ws;
end;

function WideToUTF8(const WS: WideString): UTF8String;
var len: integer;
us: UTF8String;
begin
Result:='';
if (Length(WS) = 0) then
exit;
len:=WideCharToMultiByte(CP_UTF8, 0, PWideChar(WS), -1, nil, 0, nil, nil);
SetLength(us, len);
WideCharToMultiByte(CP_UTF8, 0, PWideChar(WS), -1, PChar(us), len, nil, nil);
Result:=us;
end;

function AnsiToUTF8(const S: AnsiString): UTF8String;
begin
Result:=WideToUTF8(AnsiToWide(S));
end;

function UTF8ToWide(const US: UTF8String): WideString;
var len: integer;
ws: WideString;
begin
Result:='';
if (Length(US) = 0) then
exit;
len:=MultiByteToWideChar(CP_UTF8, 0, PChar(US), -1, nil, 0);
SetLength(ws, len);
MultiByteToWideChar(CP_UTF8, 0, PChar(US), -1, PWideChar(ws), len);
Result:=ws;
end;

function WideToAnsi(const WS: WideString): AnsiString;
var len: integer;
s: AnsiString;
begin
Result:='';
if (Length(WS) = 0) then
exit;
len:=WideCharToMultiByte(CP_ACP, 0, PWideChar(WS), -1, nil, 0, nil, nil);
SetLength(s, len);
WideCharToMultiByte(CP_ACP, 0, PWideChar(WS), -1, PChar(s), len, nil, nil);
Result:=s;
end;

function UTF8ToAnsi(const S: UTF8String): AnsiString;
begin
Result:=WideToAnsi(UTF8ToWide(S));
end;

end.
